
nav>div{
    border-top: 1px solid #000;
    border-bottom: 1px solid #000;
    width: 100%;
    height: 100px;
    display: flex;
    padding-left: 200px;
}
nav>div>div{
    width: 100px;
    height: 100px;
    text-align: center;
    line-height: 100px;
    font-size: 24px;
}
nav>div>div:hover{
    background-color: red;
    font-size: 30px;
}
h3{
    margin-left: 20px;
    line-height: 100px;
}
input{
    margin-left: 50px;
    margin-top: 20px;
}
input[type=text]{
    width: 200px;
    height: 50px;
}
img{
    width: 40px;
    height: 40px;
    margin-left: 40px;
    margin-top: 20px;
}
article{
    display: flex;
    border: 1px solid #e5e5e5;
}
article>section:first-child{
    width: 820px;
    height: 600px;
    display: flex;
    flex-wrap: wrap;
    margin-left: 50px;
}
article>section:first-child>div{
    width: 180px;
    height: 270px;
    border: 1px solid #e5e5e5;
    margin-top: 20px;
    margin-left: 20px;
}
article>section:first-child>div>div:first-child{
    height: 220px;
}
article>section:first-child>div>div:first-child>img{
    margin: 0;
    width: 180px;
    height: 220px;
}
article>section:first-child>div>div:last-child{
    height: 50px;
    text-align: center;
    line-height: 50px;
    color: red;
    font-size: 16px;
}
article>section:first-child>div>div:last-child:hover{
    background-color: pink;
    font-size: 20px;
}
article>section:last-child{
    width: 600px;
    height: 600px;

}
article>section:last-child>div{
    width: 400px;
    height: 600px;
    margin: auto;

}
article>section:last-child>div>div{
    margin-top: 15px;
}
#ptes>div>p:nth-child(-n+3){
    color: red;
}